Year	Percent
1950	16.80921
1955	17.40528
1960	17.64154
1965	17.54999
1970	17.52002
1975	17.8652
1980	17.65741
1985	17.50796
1990	17.28221
1995	17.19352
2000	17.44787
2005	17.59531
2010	17.29786
2015	16.75309
2020	16.0553
2025	15.5216
2030	14.96434
2035	14.32524
2040	13.59324
2045	12.85335
2050	12.14094
2055	11.48739
2060	10.87901
2065	10.29673
2070	9.75626
2075	9.24482
2080	8.77711
2085	8.34252
2090	7.94268
2095	7.59098
2100	7.23739